Fetal hemoglobin is made up of two alpha- and two gamma-globin chains, so it doesn't include the mutated beta-globins.

HbF由两条α-和两条γ-珠蛋白链构成，不包括突变的β-珠蛋白。

But, for example, if I looked at, fetal hemoglobin relinquishes that oxygen at lower oxygen tensions.

但是，举个例子，如果我看到，胎儿血红蛋白在较低的氧张力下放弃氧气。

Another preventative medicine is hydroxyurea - which works by increasing the amount of gamma-globin - which results in more fetal hemoglobin, or HbF.

另一种预防药物是羟基脲；它通过增加γ-珠蛋白，以产生更多的胎儿血红蛋白（HbF）。